Typewriting-machine



B. C. STICKNEY. TYPEWRITING MACHINE.

APPLICATION FILED MAR. 4,191@

Patentedv Got. 1l, E921.

2 SHEETS-SHEET I.

w@ @Je O /m/ew for:

B. C. STICKNEY.

TYPEWRITING MACHlNE.

APPLICATION FILED MAR.4, |918.

Patented rOct. 11, 19Mo @MQW STATES T QFFICE.

noitNHAM c. smicKNEY, or ELIZABETH, NEW JERSEY, AssieNon 'ro UNBERWOOD r'rrnwnifinn coMrANY, or NEW Yonx, N. Y., n oonronATIoN or :DELAWARE TYrnwnIriNe-macni-NE.

Lenaerts.,

Specification of Letters Patent.

Patented-9ct. 11, 1921a Application tiled-March 4', 1918. Serial No. 220,124.

To all whom it may concern." Y

Be it known that I, BURNHAM C. STICK- Nirr a citizen of the United States, residing in Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Typewriting-Machines, of which the following is a specification. v

This invention relates to typewriting machines of the front-strike variety, and particularly to means for rendering it convenient to make erasures while the work is retained in the machine. It is herein disclosed as applied to an Underwood typewriting machine. In this class of machines, the typing is done at a point on the work which is so` close to the ribbon-vibrating mechanism and the type-guide, and other devices, that it is inconvenient to' make ,erasures Moreover, owing to the fact that the erasure usually l is made so close to the 'ribbon-vibrating mechanism, and just above it, the detritus is apt to, fall onto and clog the mechanism.

The principal object of this invention is to render it practicable and convenient" to shift the work away from the ribbon guide, front scale, etc., to a position more convenient for erasing purposes, and then to restore the Work to the position from which it was shifted. In the form of the invention herein illustrated, the work is moved upwardly, so that the line of Writing is broughttemporarily toward the top of the platen, where it may be held mechanically during the operation of erasing, and then restored by being shifted downwardly to adapted to give the laten a stroke of identical predetermined ength in each direction, so that, upon the return stroke, the work will be broughtexactly to its former position.

'To avoid 'liabilit ofl objection arising from the running o the feed-rolls over the platen arising from t any of the work-sheets, by reason of thev repeated'running of the rolls thereover.

Since it is necessary for the work to accompany the platen inthe described lifting revolution thereof; there may be provided a device to clip the work temporarily to the platen, and this device or clip is 'advantageously brought automatically into operation just before the usual feed-rolls are cast off, so thatthe work is held to the platen by the clip during the entire shifting in both directions, whereupon the rolls are automatically restored, and 'the clip is automatically released.

Provision is preferably made for avoiding the noise and resistance to free movement that would occur durin the rotation of the e usual line-spacespring-check or detent. This detent therefore may be made to accompanying the platen in its rotation to and fro;

In the present disclosure, the mechanism is for the sake of illustration shown as advancing a work-sheet some three line-spaces,

being shown in a form adapted to be used in many of the types of the Underwood typewriting machine now on the market, with practically no change of the principal parts. To increase the throw of the platen,

so as to bring the writing line to the top side ofthe platen, requires only a :re-proporticning of parts, longer strokes, and a retiming of cams. It will be apparent to those skilled in the art that the structure herein shown may be adapted to suit ,other inachines also, and that the 'mechanism' may be caused to impart any desired throw to the platen, by varying the proportions of parts.

Other features and advantages will hereinafter appear.

In the accompanying drawings v Figure 1 is an end view of an'Uznderwood typewriter carriage, showing they present invention as applied thereto, the parts being in ordinary writing position.

Fig. 2 is a similar view, showing the eras- Y the sprin ving-mechanism handle, moved through4 a in Fig. 1, much of the carriage being brokenl awa The work-sheet or sheets l are introduced, in the usual way, between the platen 2 and the forward and rear feed-rolls 3 and 4 which run upon the unler side thereof, said feed-rolls` being contre! led by the usual release-key 4a, whereby they may be cast off, at will, through rotation of the usual shaft 5, for convenience 'in inserting the sheets. The platen is line-spaced in the usualvmanner by means of a handle or driver 6, which operates a slide 7 carrying a pawl 8 to engage and drive the ratchet-wheel or linespace wheel 9, which is fixed to the platen axle l0; the platen being held against accidental displacement by means of a detent roll 11, which engages the notches in the line-space wheel 9, and is mounted upon a pivoted detent arm 12 having a spring 13 to press then roll 11 into thek notches, and thereby control the platen.

When it is desired to shift the work to a position convenient for making erasures,

lthere is brought into use a shifter, having an arm 14 whereby 'it may be manipulated and lpivo'ted concentrically with the platen, and

capable of giving the platen an advance revolution to .bring the writing line higherv up on the platen. This shifter'is normally dis connected from the platen, and is normally held against movement by means of a bolt or a lock, which is releasable bymeans of a finger-piece 15. The finger-piece 15 may be pivoted on the arm 14` and comprises an arm 16 having a locking bolt 17 to engage a slot 18 formed in the framework of the pjlaten frame,` which is usually a part of the nderwood typewriting machine. By lifting the finger-piece against the tension of 19, which normally holds it effective,ft is bolt 17 is withdrawn and the platen-positioning arm 14 may be turned upon the axle 10, said arm having a fingerhold 20, whereby it may be operated, and this linger-hold 20 being preferably close to the releasing finger-piece 15, `so that it maybe grasped by a thumb and a fin-ger,l

whereby the arm will become almost automatically released by for the purpose of rotating the arm.

During the initial part of the stroke of the arm 14, and before the laten is rotated thereby, there is moved against the platen a paper-clip or other worksheet-holding de- Vroll-carryin grasping the device* vice which may comprise, for example, a cross-bar 21 forming part ofa bail having arms 22 supported-on the axle 10, Figs. 1 and 4. The cross-bar or work-sheet-holder extends longitudinally of theplaten and -stands normally below or away from the platen in notches 23 formed in the bottom` paper-apron, Fig. 4, which is usually provided for the platen of an Underwood machine. The clip-bar 21 may be operated by an arm 24 having a roll 243L to run upon a double-cam 25,- which is formed by a slot upon said positioning arm, this cam including a comparatively steep portion 26 to cause the first movement of the arm to bring theclip into action, Fig. 2. To do this, the arm 24 rocks a stub-shaft 26a having at its inner end an upwardly-projecting arm 26", to swing the'latter and cause a pin 26, projecting through a'. slot in the platen frame, to raise the clip to its effective position by engaging in a cam-slot 36d formed in ythe larm 22 of said clip. The cam also comprises a dwell 27 so that the clip 21 will re.

which is connected tothe roll-release key,.

aforesaid, is provided with an arm 28 having a. roll 29 to run upon a second cam-30 which is providedpon said platen-rotating arm 14. This second cam includes a steep portion 31 adapted to cause the release shaft 5 to be: come effectiveas soon as the paper-clipping action of the first cam 25 is completed, Fig. 2.` When the roll runs upon the 'second cam 30, the releasing shaft 5 is rocked, and the usual cams 32, which are provided thereon, Figs. 3 and 5, operate to swing the releasing arms which are formedupon the usual arms. The releasing cam 30 terminates 1n a dwell 33, along which the roll 29 runs during the remainder of the stroke of the arm, whereby the feed-rolls are held o'i' from the platen during the entire advance and return strokes thereof.

The operations of clipping the paper to the platen and `releasing the feed-rolls are ed to drive the platen, this connection cony sisting of the detent 12, which has already been described. The frame comprises an arm 35, to which said detent is pivoted.

ingame During the preliminary movement of 'the arm 14, the frame 34 is held by a spring 84a, thus permitting the actuation of the clip and the releasing fof the feed-rolls. After the releasing of the feed-rolls, the end of the cam-slot 25 is reached by the roll 24a. rlhus, during the final portion of the stroke of the arm, said frame is rocked, the stub-shaft 26a being carried thereby, and by means of the detent drives the ratchet-wheel, which is fixed to the platen axle, whereby the platen is rotated, until the arm 14 is arrested by a stop 37 whereupon the spring 19 projects the locking bolt into a second slot 39, Figs. 1 and 3, which is formed upon the platen frame aforesaid', so that the platen is locked in this position, convenient for erasure, and where the detritus is not apt to drop into the ribbon mechanism.

To effect an equally distributed pressure of the clip against the work-sheet around the platen, l have duplicated, on the righthand side of the platen, the mechanism for actuating said clip, so that it is moved parallel to itself, said mechanism comprising an actuating element 45 which is moved simultaneously with the arm 14.

To move the element 45 simultaneously with the arm 14, l have provided a connection between them. rlhis may comprise a rock shaft 46 supported'by brackets 47 on the platen frame, movement being imparted to said rock'shaft from said arm 14 through the intermediary of a pin 48 projecting from said arm into a slot 49 formed in the free end of an arm 50, which is secured at the left-hand. endV of said shaft, rlfhe right-hand end of said rock shaft 46` is providedk with a similar arm 51 engaging with a pin 52 projecting from the element 45; Thus, the movement is transferred from said rock shaft to said element, and said element is moved simultaneously with said arm 14. The frame 34 comprises also a tie-rod'41 connecting the arm 35 to a similar arm 35a, each of these arms having extensions 42 eX- tending past the platen axle, and said arms carrying at their lower ends the stub-shafts 26 (Fig. .f

The extensions 42 are alsopprovided with pins 53 projecting into slots 54 formed in the. arms 22 of the clip 21 to guide the latter in its movements to and away from the platen. lt will be seen that the pins project through slots 55 formed in the arms 261. This is Yto permit a movement of said arms tov render said clip effective before the frame 34 is moved bythe arm 14, as hereinbefore described.

is soon as the-erasure is completed, the operator again grasps the finger-.piece 15, releasing the platen-driving arm 14, and then swings said arm upwardly to a normal .position, during which operati-on the platen rotates' backwardly7 the paper being held by the clip `21 until the platen is returned to initial position, whereupon a stop 43, in the path of the detent arm 35, arrests said arm, together with said detent 11, 12 and the ratchet-Wheel and platen.

During the completion of the return movement of the platen-rotating arm 14, the roll 29 runs down the cam 31 upon said arm, to permit the shaft 5 to rock and permit the feed-rolls 3 and 4 to berestored to the platen by the usual return springs, and then the roll 24a 4is positively moved by the first cam 25, to withdraw the paper-clip from the platen. Upon releasing the device, the spring 19 restores the locking bolt 17, so that the platen-rotating arm is held against displacement. Said locking bolt holds said arm steady during the normal operation of the machine, so that it affords a satisfactory anchorage for the detent 12 which holds the platen steady during the typing operation.

While thel invention has been described as applied to an erasing device, certain elements and sub-combinations of the mechanism may be used for other purposes and in other combinations.

Variations may be resorted to Within the sco e of the invention.

'Iaving thus described my invention, l claim:

l. In a typewriter, in combination, a revoluble platen, mechanism normally in effective relation to cooperate therewith as means to feed. workesheetsv thereabout, a normally ineffective worksheet-holder, and a common operating device for said holder and feeding means, comprising means to render said holder effective to clamp said sheets against said platen, means to render said feeding means ineffective, and means to rotate said holder and Y laten'witli said sheets clamped rmly there etween.

2. ln a typewriting machine, the combination with a revoluble platen, of feeding devices adapted to hold a work-Sheet upon said platen to cause it to move with the revolving platen, other feeding devices adapted to grip the work-sheet to said platen, a finger-piece movable to free the first-mentioned feeding devices from the platenand to cause said other feeding devices to grip the platen and rotate 'therewith to carry the `work-sheet around the platen, a linespace mechanism for said platen including a detent and awheeh and means whereby said detent turns said Wheel lto` revolve the platen. y

ln a. typewriter, in combination, a revoluble platen mechanism comprising feedrolls normally in effective relation with said platen to cooperate therewith as means to i .feedy worksheets thereabout, anormally ineffective worksheet-holder, and a common voperating device' for said holder and feeding -.means, comprising means to render said fective relation to coperate therewith asmeans to feed` work-sheets thereabout, a normally ineffective worksheet-holder, and

a common operating device for said holder and feeding means, comprising means to render said holder effective to clamp said sheets agalnst said platen, means to render said feeding means ineffective, and means to impart an advance rotation to said holder and platen with said sheets clamped firmly therebetween, said operatin device also affording means to restore sa1d holder, platen and the work-sheets clamped therebetween to the positions from which they were advanced, td permit said feeding means to again become effective, andV to render said holder ineffective. j

5. In a typewriter, in combination, a revoluble platen, mechanism normally in effective relation to coperate therewith as means to feed work-sheets thereabout, a normally ineffective worksheet-holder,A and a common operating device for said holder and feeding means, comprising means to render said holder effective to clamp said sheets against said platen, and means to render said feeding means ineffective; said platen and holder, with said sheets clamped therebetween gether, said sheets being free from said feeding means during such rotation.

6. In a typewriting machine, incombination, a platen frame, a platen, an axle on which said platen is mounted in said frame, mechanism. comprising feed-rolls normally in effective relation with said platen to cooperate therewithlas means to feed worksheets thereabout, al normali ineffective paper-holder shiftably mounts on said axle, a swinging frame mounted on said axle, means mounted in said frame for shifting said paper-holder into effective paper-clamping relation with said platen, and-acemmon operating mechanism for said feeding means and paper-holder, said operating mechanism comprising means to so operate said shifting means as-to render said paper-holder effec' tive, means `to move said feed-rolls away from said platen, so as to render said feeding means ineective, and means to effect a rotation of said. platen, paper-holder, swinging frame and shifting means about said yaxlev independently of. said feeding means. Y

7. ln a typewriting machine, the combination with a revoluble platen, of feed-rolls adapted to .holdfawork-sheet against said lbeing free to be rotated toneeavt to clamp the work-sheet to said platen, andk connections whereby saidfinger-piece thereafter causes the platen to rotate with said device, said connections including an extension of said frame, a line-space wheel for said platen, and a detent pivoted on said frame adapted to bear against said lincspace wheel.

8. ln a typewriting machine, the combination with a revoluble platen, offeed-rolls adapted to hold a work-sheet against said platen, a casting-0E element for said feedrolls, anormally ineidective worksheet-holding device adjacent said platen, connections forsaid device, a frame on which said connections are mounted, an axle for said platen on which said frame is journaled, a ngerpiece adapted to he moved to castlod said feed-rolls and to cause said device to clamp the work-sheet to said platen through-said v for said device, a framev on which said connections are mounted, an axle for said platen on which saidframe is journaled, a fingerpiece adapted to be moved to cast ed said feed-rolls and tocause said device to clamp the work-sheet to said platen through said connections, other connections whereby said finger-piece thereafter causes 'the platen to rotate with Isaid device, said connections including an extension of said frame, a linespace-wheel for said platen, anda detent pivoted on said frame adapted to bear against said line-space-wheel, and means normally holding said nger-piece ineffective 4and adapted to belset to cause said finger-piece to remain eective.

10.1n` a typewriting machine, the combination witha revoluble platen, of feed- `v-rolls adapted'to hold a work-sheet against yplaten on which said .jnger-piece is pivoted,

a cam by which said finger-piece operatesplaten but normallyineffectiveandextending said Work-holding-device, and a cam adapted to make said 'casting-ofi device effective after said first-named cam has made the work-holding-device effective.

11. In a typewriting machine, the combination with a revoluble platen, of feedrolls adapted to hold a Work-sheet against said platen, a casting-off device for said feed rolls, a Work-sheet-holding-device adapted to clamp the Work-sheet against said platen, a finger-piece operable to make said holdingdevice eiective, an axle for said platen on which said linger-piece 4is pivoted, a cam by which said finger-piece operates said Workholding-device, a second cam adapted to make said casting-off device effective after said first-named vcam has made the Workholding-device effective, a frame on which said Work-holding-device is journaled, an axle for said platen on Which said frame is journaled, a detent device for said platen on said frame, andy a lost-motion connection between said finger-piece and Said frame to move the platen after the Work-holding-device has become effective;

12. In a typewriting machine,-the combination With a revoluble platen, of feedrolls adapted to hold a Work-sheet against said platen, a casting-off device for said feed rolls, a Work sheet holding device adapted to clamp the Work-sheet against said platen, a finger-piece operable to make said holding-device effective, an axle for v,said platen on which Said finger-piece is pivoted, a cam by which said finger-piece operates fsaid Work-holding-device, a cam adapted to make said casting-off device effectiveafter said first-named cam has made the Workholding-device effective, va frame on Which said Work-holding-device is journaled, a detent device forsaid platen on said frame, a lost-motion connection between said fingerpiece and said frame to move the platen after the Work-holding-device has become effectve, and means adapted to detain said finger-piece in either its normal position or the position in which it has been moved to move the platen. l

13. In a typewriting machine, the combination with a revoluble platen and a paper-apron adjacent thereto adapted to curve work-sheets around the platen, of a Worksheet-gripping-device adjacent said platen but normally ineffective and extending through depressions in said apron, and a finger-piece normally holding said -device ineffective but adapted to be moved to grip the platen to hold a Work-sheet thereagainst,

so that it Will travel with the platen.

paper-apron adjacent thereto adapted to curve Work-sheets around the platen, of a work-sheet-gripping-device adjacent saidf through depressions in said apron, a fingerpiece normally holding said device ineffective but adapted to be moved to grip the platen to hold a Work-sheet thereagainst, so that it Will travel with the platen, feed-rolls extending through said a ron, a casting-off element for said feed-rol s, and means for casting off said feed-rolls by the operation of said finger-piece after it has made the device effective. 4

15. In a typewriting machine, the combination with a revoluble platen and a paperapron adjacent thereto 4adapted to curve Work-sheets around the platen, of a Worksheet-gripping device adjacent said platen but normally ineffective and extending thro-ugh depressions in said apron, a fin erpiece normally holding said device ine ective but adapted to be moved to grip the platen to hold a work-sheet thereagainst, so that it Will travel with the platen, feedrolls 'extending through said apron, a casting-offv element for said feed-rolls, means for casting ofi' said feed-rolls by the operaf tion of said finger-piece after it has made the device effective, and connections Whereby the finger-piece, on its further movement, causes the platen and ldevice tc rotate together.

16. In a typewriting machine, the combinatio-n with a revoluble platen and an apron for curving a work-sheet therearound, of a device extending Within openings in said apron and adapted to be moved against the platen tol 'p the Work-sheet thereto an axle for said platen, a frame journale on said axle, actuating means on said frame, and a finger-piece adapted to move said device clear of the ap-ron and against said platen through the intermediary of said' actuating means, so that the platen and device 'vvill rotate together.

17. In a typewriting machine, the combination with a revoluble platen and an aprn for curving a Work-sheet therearo-und, of a device extending along and Within openings in said apron and adapted to be moved against the platen to grip the work-sheet thereto, an axle for said platen, said device being mounted on said platen axle, a 'frame being journaled on said axle, actuating means on said frame, a finger-piece adapted to move said device clear of the apron and against said platen through the intermediary of said actuating means, so that theplaten and device will rotate together, a detent for said platen, and an extension of said frame on which said detent is mounted.

18. In a typewriting machine, the combination with. a revoluble-platen and a paperapronadapted to curve a Work-sheet therea around, of a device near said platen. and extending throughout its len h, but normally ineiective, and lying wit in openings 1nA said apron, a rod on which said device is mounted to cause the twoends to move together, a linger-piece adapted to move said device to cause it to bearagainst the platen, and connections whereby, after said device bears against the platen, the platen and device move together. l

19. In a typewriting machine, the combination with a revoluble platen and a paperapron adapted lto curve a work-sheet there-- around, of a device near said platen but normally ineffective, a rod on which said device" is mounted, a finger-piece adapted to move said device to cause it to bear against the platen, connections whereby, after said device bears against the platen, the platen and device move together, a frame yjournaled on said rod and carrying intermediate actuating means for said device, feed-rolls for said platen, and a cam fast to said fingerpiece adapted to cast olf said feed-rolls after movin v said device against the platen.

20. n' a typewriting machine, the combination with a revoluble platen, of feedrolls adapted to hold a. work-sheet against said platen, a casting-olf device for said feed-rolls, a normally ineffective device adlto jacent said platen, an axle for said platen on which said device is journaled, a fingerpiece adapted to be moved to cast off said feed-rolls and to cause said device to clamp the work-sheet to said platen, and connections whereby said finger-piece thereafter causes the platen to rotate `with said device first in one direction and then in the other.

21. In a typewriting machine, the combination with a revoluble platen, of feeding devices adapted to hold a worksheet upon said platen to cause it to move with the revolving platen, other feeding devices adapted to grip the work-sheet to saidplaten, a finger-piece movable to free the first-mentioned feeding devices from the platen and to cause said other feeding devices to grip the platen and rotate therewith to carry the work-sheet around the platen, a line-space mechanism for said platen including a detent and a wheel, and means whereby said detent turns said wheel to revolve the platen rst in one direction and then in the other.

22. In a typewriting machine, the combination with a revoluble platen and feedrolls adapted to hold a work-sheet against said platen, of devices for casting on said feed-rolls, a device adapted to be clamped to said platen to hold the work-sheet to said platen and to travel therewith, and a fingerpiece adapted .to clampV said device against said platen and. then to make said castingoff devices effective, and-thento rotate said platen with said clamping device to carry `the work-sheett/a a new position first in one direction and then in thel other. v

23. In a front-strike typewriting machin-e, the combination with a revoluble platen, of

a manually-operable device for rotating said platen forwardly and backwardly, and 'a normally ineffectivewqrk-clip movable by said manually-operable/device against said platen to carry the work around with the platen.

24;. In a front-strike typewriting machine, the combination with a revoluble platen, of a "manually-operable device forv rotating said platen forwardly and backwardly, a normally ineffective work-clip movable by said manuallyoperable device against said platen to carry the work around with the platen, and means independent of said workclip for normally coperating with the platen to feed the work around theA same.

25. In a front-strike typewriting machine, the combination with a revoluble platen, of a manually-operable device for rotating said platen forwardly and backwardly, a normally ineffective work-clip movable by said manually-operable device against said platen to carry the work around with the platen, means independent of said work-clip for normally coperating with .the platen to feed the work around the same, and means also controlled by said manually-operable device for releasing said normally effective work-feeding means concomitantly with the movement of said clip to the platen.

26. rllhe combination -with a revoluble platen and a rollto run thereon, of a workclip, a manually-operable device to rotate the platen forwardly and backwardly, and means to enable said manually-operable device first to move said clip against the platen, and then togrelease said roll and rotate said platen. 4` i 27. rlhe combination with a .revoluble platen, of a normally ineffective clip for holding the work to the platen, a manuallyoperable device, means controlled by said manually-operable device to move said` clip against the platen, a feed-roll to runupon the platen, means operable by said manually-operable device for releasing said feedroll, a ratchet-wheel connected `to `said platen, a detent engaging said ratchetwheel, and means to enable said manually` operable device to advanceL and/return said platen by means of said detent.

28. rlhev combination of a revoluble platen, a work-clip normally ineffective, a manually-operable device, a cam to enable said manually-operable device tomove said work-clip against the platen, a frame mounted to swing about the platen axis, said workclip vbeing controlled by mleans mounted upon said frame so as to travel therewith during the rotation of the platen forwardly and backwardly, a feed-roll to run upon the platen, a second cam operable by said manually-operable device to release said feed-roll, a line-space wheel connected to said platen, a detent upon said frame to vengage said line-'space wheel, and means effective after the clipping of the work and the release of said feed-roll, for enabling said lmanually-operable device'to swing said frame, and ythereby drive the line-space wheel and platen.

:29. The combination with a platen having a printing point at the front thereof and around which a work-sheet may be fed, of feed-rolls normally holding said work-sheet against said platen, means for changing the position of the work-sheet relatively to the printing oint, said feed-rolls being rendered ine ectiveduringthe changing of the position of said work-sheet, a platen axle, a clamping bar extending lengthwise of said platen and supported on said platen axle, and means for actuating said clamping bar to hold said work-sheet before said feedrolls are rendered ineffective. c

30. The combination with a platen having a printing point at' the front thereof and around which a work-sheet mav be fed,`of feed-rolls normally holding said work-'sheet against said platen, means for changing the position of the work-sheet relatively to the printing point, said feed-rolls being rendered ineifective when changing the position of nsaid work-sheet, a platen axle, a clamping bar extending lengthwise ofgsaid platen and supported on said platen axle, means for actuating said clamping bar to hold said worksheet-before said rolls are rendered ineifective, and means for rotating said platen with said clamping bar after. the feed-rolls have been rendered ineii'ective.

31. lIn a typewriting machine, in combination, a platen, a normallyineffective paper-holder extending from end to end thereof, and an operating mechanism for moving said holder into clamping relation with said' platen, said mechanism comprising a pair of actuating devices, one adjacent each end, means connecting said devices .so as to cause them to operate in synchronism, and an operating finger carried by one of the devices of said operating mechanism.

32. The combination with a platen having a printing point at the front thereof and aronndwhich a work-sheet may be fed, of a normally ineffective device adjacent to said platen and extending from side toside thereof, means at each side of said device to actuate said device to clamp 4the work-sheet against said platen prior ,to a displacing 'movement of said work-sheet relatively to the printing point, said means comprising two actuating elements, one at each side of said device, and means connecting said actuating elements, said connecting means comprising a rock shaft, two arms, one at each end of said rock shaft., each arm extending adjacent to one of the actuating elements, and each arm having a pin-and-slot connection with its associated element.

33. In atypewriting machine, in combination, a platen frame, a platen, an axle on which said platen is mounted in said frame, a normally ineffective paper-holder shiftably mounted on said axle and extending from end to end of said platen, a swinging frame mounted on said axle, a pair of shifting elements mounted in said swinging frame, one for each end of said holder, and an operating mechanism by which said shifting elements may be caused to shift said holder into clamping 'relation with said platen, and by which said platen, holder and swinging frame may be rotated together about said axle, said voperating mechanism `comprising a pair of actuating devices, one

for each shifting element, means mounted in said platen frame and connecting said devices soY as to cause them to operate in synchronism, and an operating finger-piece carried by one of the elements of said operating mechanism. v

34. The combination with a platen having a printing pointat the front thereof and around which a work-sheet may be fed, of a normally ineffective device adjacent to said platen, a platen axle, said device being sup-` ported on said platen axle, a swinging frame supported on said platen axle, actuating elements at veach side of said device, a connection between 4said, actuating elements, a iinger-piece ony one of said actuating elements, connections from said actuating elements to said device, said last-mentioned connections comprising means supported by said swinging frame, the means-of each of said connections c'omprising two arms, a stub shaft upon which said arms are mounted,v one of said arms being engaged by a cam on the associated actuating element, the other arm engaging with a cam on said device.

35. The combination with a platen having a printing point at the front thereof and around which a work-sheet may Jbe fed, of

a normally ineffective device adjacent to said platen, a platen axle, said device being supported on said platen axle, ,a swinging frame supported on said platen axle, actuating elements at each side of said device to render said device effective to clamp the work-sheet, a connection between said elements, a finger-piece on one of said actuating elementsjconnections. fromsaid actuating elements to said device, said lastmen tioned connections comprising means sup'- ported by said swinging frame, and means carried by said swinging frame to guide said device while it is being moved to its clamping position.

36. The combination with a platen yhaving a printing point at the front thereof and around which a` work-sheet may be fed, of a normally ineffective device adjacent to said platen, feed-rolls, an actuating element comprising a finger-piece, a'swinging frame,

a connection` comprising mechanism supported by said swinging frame for rendering said device effective by said actuating element, said actuatingelernent being effective 5to render said feed-rolls ineffective after said device has been rendered effective',

n means comprising a spring to retain said swlnglng frame 1n its normal position untll the feed-rolls have been rendered ineffective,

10 and a .yielding connection between said swinging frame and said platen, said actuatl BURNHAM C. STICKNEY.

Witnesses:

EDITH B. LIBBEY, CATHERINE A. NEWELL. 

